Flowering something

Not sure what this plant is, it's prickly and rampant and this time of year has a sweet smelling pink flower. It smells a bit like elderflower. I had a long blackberry picking walk today. It has rained so much in the last week or two that very unusually, the blackberries have become edible... Instead of the dried up apologies for blackberries that we get usually. A rare treat.